William b



(No Model.)

W. B. RISDON.

INSBRTIBLB SAW TOOTH.

No. 298,892. Patented May 20, 1884.

INVENTOR.

ATTORNEYS.

N. PETERS PhoQo-Lilhugraphsr. Wnhingwn. n. C.

WILLIAM B. RISDON, OF TRENTON, NEW JERSEY, ASSIGNOR TO THE .AMERIOAN SAXV COMPANY, OF SAME PLACE.

INSERTIBLE SAW-TOOTH.

SPECIFICATION forming part of Letters Patent No. 298,892, dated May 20, 1884.

Application filed February 18, 1884. (No model.)

To all whom it may concern Be it known that I, WILLIAM B. RrsDoN, of Trenton, in the county of Mercer and State of New Jersey, have invented a new and useful Improvement in Insertible Saw Teeth, of which the following is a full, clear, and exact description.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar letters of reference indicate corresponding parts in all the figures.

Figure 1 is a side elevation of a part of a saw-plate, illustrating my improvement. Fig. 2 is a side elevation of the bit,part being broken away. Fig. 3 is a front elevation of the same. Fig. 4. is a side elevation of the bit-holding spring. Fig. 5 is a rear elevation of the same.

The object of my invention is to provide insertible saw-teeth constructed in such a manner that they can be used in places where it is desirable or necessary to remove and replace the bits or teeth without'taking the saw from the mandrel, or even without removing the holdingspring from its seat; and to this end the invention consists in the peculiar construction and arrangement of parts, as hereinafter fully described, and pointed out in the claim.

A represents the sawplate, which has curved recesses 13, formed in it, to receive the bit-holding springs and the bits D. The forward end of the base of the spring C is made square and rests against a shoulder, E, formed in the saw-plate A. The rear end of the base of the spring 0 is formed with the toe c, resting in a recess, (1, of a projection, F, formed on the saw-plate A, and projecting into the recess B. The outer or convex edge of the base of the spring 0 has a \/-shaped groove, G, formed in it, to receive the V-shaped edge of the plate A and hold the said spring from lateral movement. The spring 0 is locked in place by a pin oryrivet, H, driven into the inner end of a short slot or slit, I, formed in the convex edge of the'said spring, near its forward end, as shown in Figs. 1 and 4, so as to press the ends of the said base of the spring against the shoulder E and the projection F. The spring 0 is provided with the projection or tongue a, between which and the edge of the sawplateA the bit D is held. The rear end of the bit D rests against the projection F, so that the said bit will be held securely against the inward pressure when in use. The convex rear edge of the bit D has a V-shaped groove formed in it to receive the \l-shaped edge of the saw-plate A, so that the said bit D will be held from lateral movement. The outer part of the concave forward edge of the bit D has a rounded groove, J, formed in it to receive the rounded edge 0 of the projection or tongue a of the spring 0, to hold the said bit and spring from lateral movement upon each other. The inner part, K, of the concave forward edge of the bit D is flattened to fit against the correspondingly-flattened part L of the rear edge of the projection or tongue a of the spring 0, to serve as a lock to hold the bit D in place. When the spring 0 is in position, the point of juncture of the tongue a with the base of said spring is below the projection F, as shown in Fig. 1, leaving a space, 72, to receive a tool for forcing the projection or tongue a of the spring 0 forward to allow the bit D to be inserted and removed without removing the holdingspring from its seat.

-I am aware that saw-teeth have been held in place by spring locking-plates, and Itherefore do not claim such invention.

Having thus described my invention, I claim as new and desire to secure by Letters Patent The combination, with the saw-plate A, provided with the recess B, having the shoulder E, projection F, and recess (1, of the bit-holding spring (J, provided with the tongue 0:, having the rounded edge 0 and flattened part L, the slit I and the toe 0, and secured in the said recess between the shoulder and projection, with its toe in the recess of the said projection, by rivet H, and the bit D, provided with the groove J and the flattened part K, substantially as herein shown and described, whereby thebit-holding spring will be firmly held in the recess of the blade and the bit held in place by the said spring, thereby perinitting the bit to be inserted and removed without removing the spring, as set forth.

WILLIAM B. RISDON. Witnesses:

J AMES T. GRAHAM, EDGAR TATE. 

